Plan subtitles as layers over a video, deciding which spoken phrases to omit, show normally, or emphasize behind the subject. The guidance preserves full-frame composition and limits large embedded words to occasional key moments.
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Overlay doctrine for the embedded-captions workflow — the caption MODEL (drop / rail / embed) and the rule that captions are an OVERLAY composited on top of the film, never a reserved bottom band you shift content up to avoid. Load when adding captions/subtitles to a talking-head or launch video, when deciding whether a phrase should be dropped, ride the verbatim rail, or be promoted to a scarce embedded climax, when laying out a composition that will carry captions (do NOT reserve a keep-out band), or when centering a composition on the true frame center under captions. Quotes the rail+embed model from embedded-captions and constraint
安装前可以查看交给 AI 代理的指令内容。
Overlay doctrine — supplements the upstream
embedded-captionsskill. Applies ON TOP of it; do not expect it folded into the upstream skill.
Two ideas combine here. First, the caption model — every spoken phrase is drop,
rail, or embed, and embed is the scarce earned peak, not the default. Second, the
overlay law — a caption line is composited ON TOP of the film as an overlay; it is
NOT a reserved zone, so you never shift content up or leave a dead band to "make room"
for it. The two reinforce each other: because captions ride as an overlay (the verbatim
rail in front, the occasional embed behind the subject), the composition keeps its full
frame and centers on the true vertical center.
Every spoken phrase is one of three things (verbatim from embedded-captions):
| What | How it's shown | |
|---|---|---|
| drop | filler — um/uh, stutters, self-corrections | not shown |
| rail | the default — ordinary spoken content (verbatim) | clean lower-third subtitle, in front, readable. A punch word can get an inline emphasis highlight (accent colour / active-word pop) — it stays on the rail. |
| embed | a promoted peak — the headline beat | one big word composited behind the subject (matte occlusion), designed entrance + exit |
The rail carries most of the text; embed is the scarce, earned peak — ≤1 per beat, never two adjacent/co-visible, spaced ≥ a beat apart. A short clip → usually one embed; a long explainer → ~one per section. Embedding every word is the common mistake.
This is the Standard mode shape (rail = the verbatim lower-third; embed = the climax composited behind the subject). Cinematic mode drops the rail and makes everything embed-style — use it only for pure-cinematic asks, never for explainer / voiceover where the words must read.
Quoted from the embedded-captions non-negotiables:
apex. climax = per-beat peak, not "the
single payoff of the entire clip."In a generated launch composition, when captions are enabled, finalize composites a small, minimal word-by-word caption line as an overlay layer ON TOP of the whole film (a single text line, bottom-centered, roughly the bottom ~5-8% of canvas height). It is an overlay, not a reserved zone (verbatim from constraint #13 of the product-launch-video scene agent):
captions.mjs keepout check is retired).
Finalize snapshot QA judges caption-over-content legibility visually.When captions are disabled: identical positioning freedom — the overlay simply doesn't exist.
The model says the rail rides in front and an embed is a rare word composited behind the subject — both are layers added to footage that ships untouched. The overlay law says the caption line is a layer composited on top of the whole film, not a band carved out of the layout. So in both the captioning pipeline and the launch-video pipeline, captions are an overlay you add, not a zone you reserve:
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Create a 12-second title animation in HyperFrames, where sweeping leaves reveal two headlines. Customize typography, leaf counts, sweep speed, background color, and the breeze moving the leaves that remain on the text.
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Turn a weekly Markdown changelog into a branded video project with animated interface examples, Annie narration, captions, and background music. The workflow selects key updates and builds a 45–60 second square video, with rendering performed on request.
中文简介正在准备中。当前显示英语简介。
Add an eight-second HyperFrames headline animation where square tiles lift, tilt, and flip to reveal a second message. Customize both headlines and 18 settings covering tile size, sweep direction, timing, depth, bounce, and shadows.
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Add a 3D card carousel to a HyperFrames video. Rounded cuboids enter from the right, rotate in sequence, pause on a featured card, and exit left, with 40 variables for content, geometry, lighting, and camera settings.
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Design scene transitions and animated text using matched movement direction and speed across cuts. The catalog provides concrete settings for zooms, blur, word-by-word transitions, staggered entrances, and repositioning groups of elements.
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Add synchronized subtitles and text effects to an existing single-speaker video. Choose from 35 visual styles, including readable lower captions and words placed behind the person, with local transcription, subject cutout, previews, and final video compositing.
中文简介正在准备中。当前显示英语简介。